Improvement in molding hollow ware



J. J. JOHNSTON. MOLDING HOLLOW WARE.-

No. 9,074, Patented Jurie 29, 1852.

- UNITED STATES PATENT O FICE.

JAS. J. JOHNSTON, OF CINCINNATI, OHIO.

IMPROVEMENT IN MOLDING HOLLOW WARE, 84C.

Specification forming part of Letters Patent No. 9.074, dated June 29, 1852.

To all whom it may concern:

Be it known that I, JAMES J. J OHNSTON, of Cincinnati, Hamilton county, Ohio, have invented a new and useful improvement in molding hollow ware and other similar castings with a flaring rim or its equivalent, such as cannon-stoves, &c.; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, made part of this specification.

In the drawings, to which reference is made, Figures 1, 2, and 3 represent, respectively, in outline, first, the pattern forming part of the interior and the top edge of the rim of the pot and seat for the core; second, the pattern di-J vided into two parts, (the rim b from the bulge (0,) forming the exterior of the rim'and the upper half of the bulge of the pot; and, third, the pattern forming the exterior of the lower half of the bulge and the bottom of the pot with its dropor sink. Figs. 4, 5, and 6 represent in vertical and central section these patterns attached to their follow-boards or match-plates with the flasks set thereon, and shown in dotted lines. Fig. 7 represents in similar section the core-box, and Fig. 8 the core with a seat adapted. to suit the impression made in'the flask forming the top part of Fig. 9, known as the drag, and markedc. Fig. 9 shows in similar section the handling of the flasks (the dotted lines in Fig. 5 being the form of the middle division, and the dotted lines in Fig. 4 being the form of the drag) after the mold of the portions of the pattern to be molded therein and thereonis completed, these flasks being placed upon the core in their proper turn, the corresponding portion of the corebox being removed off the core. Fig. 10 shows in similar section the flasks, as seen in Fig. 9, reversed and seated on a bottom board, the remaining portion of the core-box being removed, and the flask seen in Fig. 6, known as the cope, having its corresponding portion or bottom of the pot-pattern molded therein and put in its place upon the said divisions of the flask, these constituting the entire mold,

being the exterior and interior of a pot or.

other similar castings with a flaring rim or its equivalent. Fig. 10 also shows the metal already run in the mold of the pot, and of course in the mold of the gate or sprue. Fig. 11 represents the p ot as taken from the mold, the gate. or 'sprue being struck ofi. Fig. 12 represents in vertical and central section, lengthwise of the gate or 'spru-e pattern, the bottom portion of the pot-pattern with the'gate or sprue pattern inserted therein, the cope being thereon ramfned up and ready to be removed. Fig. 13 shows in similar section the said cope as removed from the pattern, the gate or sprue pattern still remaining in the sand and to be removed in the usual way.

My improvement in molding hollow ware or other similar castings with a-iiaring rim or its equivalent (such as the lip on cannon-stoves, cylinders, and other tubular castings) consists in using third patterns, as illustrated in Figs. 1, 2, and 3, and attached to suitable matchplates or follow-boards, (Figs. 2 and 3 giving the outside, and Fig. l a portion of the inside and top edge of the pot and the seatfor the body of the core,) whereby I mold the exterior and a portion of the interior of the article to be cast and the seat for the body of its core, thus avoiding the handling and reliandling, the settingnnd resetting, of the flasks and patterns, and the necessity for accurate adj ustment of them to one another, and also that portion of the (old style) ramming process, which has a direct and unavoidable tendency to displace the pattern of the rim from its seat upon the pattern of the upper portion of the bulge 'of the article being molded, because (when molded in the old style) it is necessary to thrust and ram the sand beneath and around the flaring rim, and thus run the risk of lifting it from its place.-

In my process the core may be molded and set aside ready for use.

division, (see Fig. 5,) and remove the bulge portion aof the pattern. I then ram up the drag. (See Fig. 4.) I then remove the upper portion of the core-box, as seen in Fig. 7, and I then place the middle division of the mold removed from the remainder b of the pattern,

as seenin Fig. 5, upon thelower portion of the core-box, the core remaining therein. place the drag (in which there is now the mold of the edge and inside of the rim of the pattern and the seat for the core) upon the middle division of the flask, as shown in Fig. 9, ready to be closed together. I then put a'bottom p I then ram up the" cope. (See Fig. 6.) I then ram up the middle I then= similar castings with afiarin g rim or its equiva'lent (such as-the lip on cannon-stoves or other tubular castings) by'using third patterns attached to suitable match-plates or followboards, and so devised that, in connection with the first and second patterns, which form the exterior, I mold these from the tdp edge, a. portion of theinterior of the desired casting, and

a true seat for the core. thus, withthe core, forming the entire mold, substantially as described and represented.

JAMES J. JOHNSTON. Witnesses:

EDMUND E. JEFFRIns, J. R. BASSE'DT, Tnos. G. CLINTON. 

